9/22/2011: You may choose a value for X that’s greater than the creature’s toughness. Its controller will draw that many cards.

9/22/2011: The effect is not optional. The creature’s controller can’t choose to draw fewer than X cards.

9/22/2011: If the creature is an illegal target when Nin’s ability tries to resolve, it will be countered and none of its effects will happen. No player will draw cards.

9/22/2011: If the ability resolves, but the damage is prevented or redirected, the controller of the targeted creature will draw X cards, regardless of how much damage was dealt or what the damage was ultimately dealt to.

9/22/2011: If the damage is lethal, the cards are drawn before the creature is destroyed (the next time state-based actions are checked).

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